The optimal culturing conditions and medium composition were studied based on microbial quantities, cellu]ase activi- ties and xylanase activities. The results showed that the optimal medium composition was composed of the following ingredients: yeast extract 0.5% , (NH4) 2SO4 0.5% , Starch 1.5% , FeSO4·7H20 0.02% , NaC15 g, KH~PO4 0.5 g, CaC12 0.1 g, K2...